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HTML

              
                <svg viewBox="0 0 200 200">
  <defs>
    <linearGradient id="gradient" gradientTransform="rotate(90)">
      <stop id="gradientStop1" offset="0%" stop-color="var(--startColor)" />
      <stop id="gradientStop2 " offset="100%" stop-color="var(--stopColor)" />
    </linearGradient>
  </defs>
  <path d="" fill="url('#gradient')"></path>
</svg>
<p>Hover!</p>
              
            
!

CSS

              
                :root {
  --startColor: hsl(0, 100%, 75%);
  --stopColor: hsl(0, 100%, 75%);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  height: 100vh;
  display: grid;
  place-items: center;
}

svg {
  width: 90vmin;
  height: 90vmin;
}

path {
  cursor: pointer;
}

p {
  position: absolute;
  font-size: 1.125rem;
  font-weight: 500;
  bottom: 1rem;
  right: 1rem;
  color: #fff;
  font-family: system-ui, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

              
            
!

JS

              
                import { spline } from "https://cdn.skypack.dev/@georgedoescode/spline@1.0.1";
import SimplexNoise from "https://cdn.skypack.dev/simplex-noise@2.4.0";

// our <path> element
const path = document.querySelector("path");
// used to set our custom property values
const root = document.documentElement;

let hueNoiseOffset = 0;
let noiseStep = 0.005;

const simplex = new SimplexNoise();

const points = createPoints();

(function animate() {
  path.setAttribute("d", spline(points, 1, true));

  // for every point...
  for (let i = 0; i < points.length; i++) {
    const point = points[i];

    // return a pseudo random value between -1 / 1 based on this point's current x, y positions in "time"
    const nX = noise(point.noiseOffsetX, point.noiseOffsetX);
    const nY = noise(point.noiseOffsetY, point.noiseOffsetY);
    // map this noise value to a new value, somewhere between it's original location -20 and it's original location + 20
    const x = map(nX, -1, 1, point.originX - 20, point.originX + 20);
    const y = map(nY, -1, 1, point.originY - 20, point.originY + 20);

    // update the point's current coordinates
    point.x = x;
    point.y = y;

    // progress the point's x, y values through "time"
    point.noiseOffsetX += noiseStep;
    point.noiseOffsetY += noiseStep;
  }

  const hueNoise = noise(hueNoiseOffset, hueNoiseOffset);
  const hue = map(hueNoise, -1, 1, 0, 360);

  root.style.setProperty("--startColor", `hsl(${hue}, 100%, 75%)`);
  root.style.setProperty("--stopColor", `hsl(${hue + 60}, 100%, 75%)`);
  document.body.style.background = `hsl(${hue + 60}, 75%, 5%)`;

  hueNoiseOffset += noiseStep / 6;

  requestAnimationFrame(animate);
})();

function map(n, start1, end1, start2, end2) {
  return ((n - start1) / (end1 - start1)) * (end2 - start2) + start2;
}

function noise(x, y) {
  return simplex.noise2D(x, y);
}

function createPoints() {
  const points = [];
  // how many points do we need
  const numPoints = 6;
  // used to equally space each point around the circle
  const angleStep = (Math.PI * 2) / numPoints;
  // the radius of the circle
  const rad = 75;

  for (let i = 1; i <= numPoints; i++) {
    // x & y coordinates of the current point
    const theta = i * angleStep;

    const x = 100 + Math.cos(theta) * rad;
    const y = 100 + Math.sin(theta) * rad;

    // store the point's position
    points.push({
      x: x,
      y: y,
      // we need to keep a reference to the point's original point for when we modulate the values later
      originX: x,
      originY: y,
      // more on this in a moment!
      noiseOffsetX: Math.random() * 1000,
      noiseOffsetY: Math.random() * 1000
    });
  }

  return points;
}

document.querySelector("path").addEventListener("mouseover", () => {
  noiseStep = 0.01;
});

document.querySelector("path").addEventListener("mouseleave", () => {
  noiseStep = 0.005;
});

              
            
!
999px

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